Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 26 Nov 2014

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

2(2)

22(22)

22(-)

10(4)

0.4(4)

11(48)

South

9(5)

19(19)

32(-)

14(6)

0.6(6)

11(44)

East

10(6)

25(25)

47(-)

5(2)

0.6(6)

16(56)

West

5(3)

19(19)

10(-)

31(13)

0.4(4)

10(42)

Central

10(7)

18(18)

42(-)

24(10)

0.5(5)

11(45)

1-hr PM2.5 (µg/m3)b Readings on 26 Nov 2014

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

7

9

16

16

12

10

9

9

7

8

13

17

South

5

11

16

5

2

3

7

4

8

19

21

15

East

6

10

11

21

21

22

24

13

23

20

15

18

West

14

13

14

17

12

11

6

6

6

7

15

17

Central

12

20

12

8

7

6

9

12

12

6

12

10

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

16

18

16

12

12

6

7

9

9

13

13

-

South

12

7

12

14

14

10

7

16

11

13

14

-

East

14

20

25

28

20

17

12

10

15

10

13

-

West

9

5

16

5

13

6

4

11

7

8

5

-

Central

9

7

9

28

11

8

9

7

10

12

9

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
26 Nov 2014

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

38

44

49

52

52

48

45

42

43

44

52

53

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

53

52

52

54

55

53

43

39

40

44

45

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.